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libbe(3): Don't allow bootfs to be destroyed

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Previously, the following sequence of events was feasible under some
circumstance:

bectl create test
bectl activate test
# the test BE dataset gets promoted and set as bootfs
bectl destroy test

I was unable to reproduce the destroy succeeding, but we should be rejecting
this before it even gets to libzfs because it would leave the system in an
inconsistent state. Forcing the user to be explicit as to which environment
should be activated instead is much better.

Reported by:	Graham Perrin <grahamperrin@gmail.com>
MFC after:	3 days
This commit is contained in:
Kyle Evans 2019-01-07 16:16:47 +00:00
parent 354c6a4422
commit f08dac4e90
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=342849
1 changed files with 2 additions and 1 deletions
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3
lib/libbe/be.c
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@ -211,7 +211,8 @@ be_destroy(libbe_handle_t *lbh, const char *name, int options)
if (!zfs_dataset_exists(lbh->lzh, path, ZFS_TYPE_FILESYSTEM))
return (set_error(lbh, BE_ERR_NOENT));
if (strcmp(path, lbh->rootfs) == 0)
if (strcmp(path, lbh->rootfs) == 0 ||
strcmp(path, lbh->bootfs) == 0)
return (set_error(lbh, BE_ERR_DESTROYACT));
fs = zfs_open(lbh->lzh, p, ZFS_TYPE_FILESYSTEM);